Exposed skin can freeze in as little as 10 minutes in temperatures of -28C and below, Environment Canada says.

Most of the GTA is under a wind chill warning with temperatures feeling as cold as -30 C in some areas as of 6 a.m. Thursday.

“Living in a cold country can be hazardous to your health,” Environment Canada says on its website to explain why it includes wind chill in its forecasts.

Frostnip and frostbite are both dangers people need to be aware of on frigid, windy days, the weather agency says.

Frostnip is a mild form of frostbite in which the skin appears yellowish or white but still soft to the touch. The skin also feels painfully tingling or burning. Environment Canada advises warming the area gradually with a warm hand or warm water.

Frostbite happens when the skin and the tissue beneath it freeze. The skin appears white and hard to the touch and the area is numb.

Get medical help, Environment Canada says. Only warm the area when you are sure you can keep it warm.

Frigid temperatures combined with the wind chill factor could see temperatures plunge to between -30C and -40C Thursday and Friday, Environment Canada said.

The weather centre advised people who have to go out to dress in warm layers, including a wind-resistant outer layer, and wear a hat, mittens and a scarf to cover exposed skin.

A wind chill warning is in effect for York, Peel and Durham regions.

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